Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 309
ned and closed by theswing of the valve on its centre.The valve is thrown by the shoul- ders on the piston, striking the valve arms. Sergeant model. 1201. ROCK DRILL, with balanced piston valve, which isthrown by compressed air inlet through ports opened by the recipro-cal motion ofthe piston.…
Mechanical movements
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
